Over time, reusable water bottles occasionally develop unpleasant odors and/or tastes. This typically occurs when bottles are stored incorrectly or cleaned infrequently.
Most rigid water bottles are made out of either polyethylene plastic (which tends to be cloudy in appearance) polypropylene (which comes in medium to dark colors) or copolyester (which can be clear, frosted or colored). Most hydration system reservoirs have polyethylene linings, which retain tastes and odors more easily than polycarbonate. But all plastic bottles can develop unwanted tastes or odors if cared for incorrectly.
General Care
Rinse it out after each use: The best way to maintain your water bottle is to rinse it out after each use and let it air dry completely.
For regular cleaning, pop it into the dishwasher or hand wash: First, make sure that your water bottle is dishwasher-safe. Most brands recommend using the top rack of your dishwasher for caps, straws, lids and other parts. You can also hand wash the water bottle with a mild dish soap and a bottle brush.
Store in a dry place: Most odor and taste problems occur when bottles are stored in wet areas or kept sealed for long periods of time with liquid inside. Polyethylene bottles can also develop unpleasant tastes/odors when they're used to store a variety of acidic juices.
Deep Cleaning
If your water bottle develops a funky taste or odor or you regularly use electrolytes or drink mixes in your bottle, it might be time for a deeper clean.
Brands like Hydro Flask, Klean Kanteen, Nalgene, Ocean Bottle, YETI and others provide specific instructions on how to clean their bottles. Always check those care instructions before using cleaning tablets, bleach or other cleaners. In general, though, you can use one many methods for deep cleaning your water bottle.
Use a water bottle cleaning tablet or alternative
- Fill your water bottle with warm water.
- Drop in the tablet or alternative cleaner (see options below).
- Let the bottle sit overnight (or follow the instructions for the cleaning tablet or brand).
- Rinse out the bottle completely (or run it through the dishwasher, if dishwasher-safe).
- Let the bottle air-dry completely.
Other cleaning alternatives
- Denture cleaning tablets
- Water and vinegar
- Water and baking soda
- Warm water and a few drops of bleach
When cleaning hydration reservoirs, rinse them thoroughly and let them completely air dry before using them again. Do not place in your dishwasher. For more information, read How to Clean a Hydration Reservoir.
Tip: Some tastes and odors can be removed from plastic water bottles simply by rinsing them with anti-bacterial mouthwash.